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Alpha-Lactalbumin-Specific IgG, Qualitative

Published: August 9, 2026Updated: August 16, 2026

A qualitative test for IgG antibodies to alpha-lactalbumin, a cow's-milk protein. Results are interpreted alongside symptoms and other allergy testing.

Quick summary

["A positive result shows exposure to alpha-lactalbumin but does not by itself confirm an active milk allergy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
51530-4
Short code
A-Lactalb IgG Ql
Synonyms
A-Lactalb IgG Ql
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What is this test?

This qualitative laboratory test checks for IgG antibodies directed against alpha-lactalbumin, a protein found in cow's milk. It is an exposure or sensitization test rather than a stand-alone allergy diagnosis.

Why might I need this test?

It may be ordered when a patient has symptoms or suspected sensitivity related to cow's-milk products. Results can help a clinician interpret a possible milk-related immune response.

How is the test performed?

A patient sample, usually serum from a blood draw, is analyzed in the laboratory with an immunoassay-based method. The report provides a qualitative result, such as positive or negative.

How do I prepare for the test?

No special preparation is usually required. Tell the healthcare provider if you have recently changed how much milk or dairy you consume, because this may affect antibody levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Alpha-lactalbumin IgG

Frequently asked questions

Does a positive result mean I am allergic to milk?
No. It indicates detectable IgG antibodies to alpha-lactalbumin, but allergy is diagnosed using the medical history, symptoms, and sometimes skin-prick or other specific allergy testing.
What does a negative result mean?
It means alpha-lactalbumin-specific IgG was not detected by this test. It does not rule out all forms of cow's-milk allergy or sensitivity.
Should I stop eating dairy based on this result?
Do not make major dietary changes based on this test alone. Discuss the result with your healthcare professional, especially if you have symptoms after consuming milk products.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy